Window sash lock



April 15, 1952 J. BARRY 2,593,243

WINDOW SASH LOCK Filed Jan. 30, 1950 7 INVENTOR Jbsejzh Barry,

' WWMW ATTORNEY Patented Apr. 15, 1952 UNITED STATES PATENT OFFICE 3 Claims.

The object of this invention is to provide an effective auxiliary sash lock to work in conjunction with the ordinary window sash lock which is conventional with window construction. This auxiliary lock prevents relative movement between the upper and lower sash units of the window.

Another object of the invention is the provision of a novelly constructed window lock which may be quickly and easily operated from the inside of a building, but which when in its locked position will be fool-proof in its prevention of unauthorized entry into the building through the window. The particular design of the working parts of this look is such that the device is not receptive to the many burglarly techniques which continuously bring about the loss of property through crime.

A further object of the invention is to present a simple device comprising three relatively movable elements which may be attached to the upper sash unit and selectively adjusted to obstruct vertical movement of either sash unit of the window.

Still another object of my present invention is to provide a locking device which may be easily applied to a Window and when in place will not be unsightly. I

Still further advantages of the invention lie in the fact that the device is simple in nature and inexpensive to manufacture, yet at the same time extremely sturdy in construction and ef fective in use. 1

These and other objects and advantages of the present invention will become apparent from the following description and the accompanying drawing in which: a

Figure 1 is a perspective view of the invention installed for use on a window;

Figure 2 is a plan view of the device also ing its installation; a

Figure 3 is a front elevation of the shown in Fig 2;

Figure 4 is a front elevational view of the invention in its locking position;

Figure 5 is a sectional view taken on the line 5-5 of Fig. 4; 1

Figure 6 is a perspective view of the retaining cap used in connection with my window sash lock;

Figure '7 is a perspective View of the locking bar element of the invention.

Similar reference characters in the several figures represent similar parts.

For many years the conventional sash lock commonly found on vertically movable windows showdevice as 2 have been found to be completely ineffective against skilled housebreakers. It is a simple operation, for instance, to spread the window jams apart with a screw driver and then inserting a pen knife to slide the locking element in an off position so that the sash panels may be moved in relation to one another to permit entry through the Window. With this in mind the present invention has been devised to offer assurance that once a window is locked in a closed position, opening of the same is virtually impossible from the outside.

As will be seen from the drawing, the window sash lock generally designated by the numeral ID consists of three basic elements, a metal base plate I I, a locking bar or shoe [2 and a retaining cap I3. The base plate H is formed at one end thereof with a flat section M which forms a convenient surface for attaching the device to a vertical frame member 15 of the upper window sash. The fiat section M is provided with a plurality or drilled apertures I6 to permit the unit to be secured to the sash frame by means of inserted wood screws I! in a manner shown best in Figs. 2 and 3. Portion M of the base plate will naturally abut the fiat inner surface of the sash frame and will extend to that point Where the fiat surface and the ornamental molding surface of the frame intersect. From this inner extremity of fiat portion M the base plate curves to form an arcuate end portion .I8 (Fig. 2). As will be seen from the drawing the arcuate portion lilprogresses outwardly from the window pane as it leaves the flat section of the base plate and thence curves back toward the window until its end It terminates at a point close to the inner surface of the glass pane 20 of the upper sash. In summary the clearest description of the general configuration of the base plate I l is that in plane it has the likeness of the conventional question mark or well known coat hanger hook.

The arcuate portion l8 of the base plate has formed therein an inverted U-shaped opening lBa having a horizontal base portion and opposing vertical legs. This inverted U-shaped opening, as will later be explained, provides a path for the movement of the retaining cap I3 a the locking shoe element I2 is moved to and from its operating position.

The second major element of the sash lock is a locking bar or shoe [2, shown in perspective in Fig. 7 of the drawing. This element is formed from a metallic bar of rectangular stock. The ends of this bar are first bent in opposite direc- 3 tions to form flanges 2| and 22 of predetermine length. Intermediate the apex of each bent flange the bar is bent double to form the element substantially as shown in Fig. 7. This last mentioned step provides the locking bar with a rounded upper end 23 which connects two depending vertical legs 24 and 25. Since leg 25 and its respective shoe flange 22 are formed slightly lower than the corresponding elements 24 and 2| it will be seen that the shoe flange 22 extends just below shoe 2I and both shoe flanges terminate with their ends 26 and 21 lying in a common vertical plane. The flanges 2| and 22 combine to provide the offset portion of the locking device which in its on position overlays the upper surface of the lower window sash to provide a rigid stop which obstructs vertical movement of either the upper or lower sash units. Flanges 2i and '22 have alined drilled apertures formed therein which are adapted to receive a small rivet 2B for rigidly securing these flanges together. As will be seen in Fig. 5 of the drawing the aperture in the lower flange 22 is countersunk in order that the lower rivet head 29 may lie flush with the exposed face of flange 22 and thus prevent unnecessary marring of the window sash due to impact betweenthe horizontal sash member 30 and the lower surface of the shoe flange 22. The Vertical legs 24 and 25 are provided with the elongated slots 3| and 32 respectively which are in alinement and'the purpose of which will be explained in detail later in the description of the invention.

As best seen in Fig. 2 the forward vertical le 24 is perfectly flat in configuration while the rearward leg 25 is transversely curved. The purpose of this specific feature is readily apparent since the locking shoe element must slide around the curved path of the arcuate portion I8 on the base plate and the most feasible manner in which to avoid unnecessary lateral play between the base plate and locking shoe is to curve the rearward leg 25. This curvature permits a snug engagement along the longitudinal center line of the inner faces of legs 24 and 25 and at the same time allows the remainder of leg 25 to flare outwardly so as to not bind the locking shoe as it progresses along the section I8 of the base plate. It should be noted that a portion of cap I3 is similarly curved.

The third element of my locking device consists of the previously mentioned retaining cap I3. The cap I3 is preferably stamped from a flat piece of sheet metal of comparatively light gauge with respect to the stock used for the elements I I and I2. The stamped plate is bent double at its center to form an inverted U-shaped element as seen in Fig. 6 and having depending legs 33 and 34. One edge of the forward leg is formed with a flange 35 bent inwardly in a plane perpendicular to said leg 33. The purpose of this flange is to act as a guide as the retaining cap is moved vertically on the locking shoe I2. It will of course be understood that the particular edge upon which the flange 35 is formed is immaterial and it has been shown on the left side of leg 33 merely for the purpose of illustration. Legs 33 and 34 are formed with alined apertures 35 which receive a single elongated rivet 31. The shank of rivet 31 is of a length corresponding to the combined thicknesses of the opposing legs of each of the members 12 and I3 and also of the arcuate section I8 of the base member. The rivet heads 38 hold the latter mentioned elements in sliding engagement to prevent the spreading of legs 33 and 34 of the retaining cap during a forceful entry attempt. Rivet 31 is also confined to a vertical path of movement limited by the extent of the elongated slots 3| and 32 formed in the locking shoe member.

In the assembly of this device the arcuate section I8 ofthe base plate is passed through the opening lying between the inner faces of legs 24 and 25 of the locking shoe member. Next the retaining cap I3 is superposedon legs 24 and 25 of the locking shoe and the rivet 31 is inserted continuously through apertures 36 and the elongated slots 3I and 32. Rivet 31 is then secured in place as seen in Fig. 5 with the plate section I8, locking shoe legs 24 and 25 and the retaining cap legs 33 and 34 sandwiched between the heads 38 of the rivet. The device is then completely assembledand ready for installation.

With the window sashes completely closed the shoe flange 22 is placed upon the horizontal surfaceof the frame member 30 of the lower sash and with this vertical position ascertained screws H are then inserted through apertures I6 to rigidly secure the base plate I I to the vertical member I5 of the upper sash. The device is then comdrawings is in an on or locked position. Re-

ferrin to Fig. 5 it will be understood that if an unauthorized attempt is made to raise the lower sash the upper surface of flange 22 will be stopped by the lower surface of section I8 of the base plate. Thus, it will be impossible for the sash units to be moved relative to one another in a vertical path. At the same time rivet 31 which lies at the bottom of the elevated slots 3| and 32 and at the bottom of the vertical leg and inverted U-shaped opening in the base plate, due to force of gravity, may not proceed in a horizontal direcown due to the presence of the upstanding protuberance 39 in the arcuate section of the base plate. Thus, in this locked position the lockin shoe or bar I2 is unable to move in either a vertical or horizontal path. In order to move the element I2 to an inoperative position it is first necessary to raise the retaining cap I3 with the fingers of the hand to a point wherev the shank or rivet ,3! lies in the same plane as the horizontal base portion of the previously described inverted U-shaped opening. At this point the locking shoe may be moved horizontally around the arcuate section I8 since rivet 3! is no longer obstructed bythe protuberance 39 between the vertical legs of the opening I8a. When the device reaches its full open position the retaining cap may then be released to permit shank of rivet 31 to descend into the opposite vertical leg of the inverted U-shaped opening thereby rigidly securing the device in an unlocked position and thus preventing accidental and annoying movement of the locking shoe by opening and closing of the window. Of course it .will readily be seen that this same device'may be applied to a bed room window in such a manner as to permit the window to be slightly open for purposes of ventilation. For this arrangement it is but necessary to attach the base plate II the desired distance above the application shown in Fig.-1 of the drawing.

From the above detailed explanation of the invention it will be seen that I have devised a simple locking mechanism which presents the first successful challenge to unlawful entry through windows. The sash lock possesses every desirable adflat portion adapted to be secured to the upper sash of a window, said plate having an arcuate portion adjacent said flat portion and curving inwardly toward the glass pane of said upper sash, said arcuate portion of the plate having an inverted U-shaped opening therethrough, a locking bar having spaced parallel legs connected at their upper ends and having stop flanges at their bottom ends projecting outwardly therefrom in the same direction, means securing said flanges together to slidably mount said bar on the arcuate portion of the base plate, said legs having alined vertical slots therein, a cap partially covering said locking bar and having depending legs adjacent the legs of said bar, the legs of said cap having alined apertures therein, and a pin passing through said alined slots and apertures and through said opening to releasably secure the locking bar against sliding movement on the base plate.

2. A sash lock comprising a base plate having a flat portion adapted to be secured to the upper sash of a window, said plate having an arcuate portion adjacent said flat portion and curving inwardly toward the glass pane of said upper sash, said arcuate portion of the plate having an inverted U-shaped opening therethrough, a locking bar having spaced parallel legs connected at their upper ends and having stop flanges at their bottom ends projecting outwardly therefrom in the same direction, means securing said flanges to gether to slidably mount said bar on the arcuate portion of the base plate, said legs having alined vertical slots therein, a cap partially covering said locking bar and having depending legs adjacent the legs of said bar, the legs of said cap having alined apertures therein, one of said legs on the cap having an inwardly depending guide flange, and a pin passing through said alined slots and apertures and through said opening to releasably secure the locking bar against sliding movement on the base plate.

3. A sash lock comprising a base plate having a flat portion adapted to be secured to the upper sash of a window, said plate having an arcuate portion adjacent said flat portion and curving inwardly toward the glass pane of said upper sash, said arcuate portion of the plate having an inverted U-shaped opening therethrough, a locking bar having spaced parallel legs connected at their upper ends and having stop flanges at their bottom ends projecting outwardly therefrom in the same direction, means securing said flanges togather to slidably mount said bar on the arcuate portion of the base plate, said legs having alined vertical slots therein, and a pin passing through said alined slots and through said opening to releasably secure the locking bar against sliding movement on the base plate.

JOSEPH BARRY.

file of this patent:

UNITED STATES PATENTS Name Date Number Ives Aug. 2, 1904 

